Busheling-furnace.



F. J. DROEGE.

BUSHELING PURNACE.

APPLICATION/FILED mimo. 1911.

995,230., Patented June 13,1911.

IERIEIIOERICK'J'.v BROEGE", 0F COVINGTON, KENTUCKY.

BUSHELING-FURNACE.

Specication of Letters Patent.

Patented June 13, 1911.

Application led- January 30, 1911. Serial No. 605,462.

of busheling furnaces, a type of metallurgical furnace used in themanufacture 'of wrought-iron out of iron and steel scrap.

In the usual manufacture of wrought-lron out of'scrap, a pile of thislatter is heated in a furnace to a pasty consistency and worked byhand-manipulated tools into a lump orl ball of convenient size suitablefor further manipulation by rolls to be formed into blooms, billets andmuck-bars from which finally the finished iron is produced. The purposeof this manipulation in the furnace is to effect certain necessarychemical changes and Vto clear the mass of slag, dross and foreignsubstances and impurities. v

My invention consists of a certain construction whereby handmanipulation is done away with, the required effect being obtained bymoving the furnace in a certain manner to produce the same results.

In the following specification and particularly pointed out in theclaims at the end thereof, will be found a full description vof myinvent-ion, together with its operation, parts and construction, whichlatter is also illustrated in the accompanying drawing, in which LFigure1, is a side-view of such a furnace with parts broken away. Fig. 2, isafront- L view of the same with parts broken away.

Fig. 3, yis a combined top-view of certain parts and a longitudinalsection of others, as they appear in Fig. 1, from which figure they areprojected down, appearing immedi ately below the same.

A is the furnace proper, it being substantially of drum-shape withaxially alined trunnions which project outwardly from opposite sides andon which it is supported for rotation. Its shape, construction andmanner of support is analogous to that of a fur-- nace shown anddescribed in my Patent No. 960,517.

.Y An iron-shell a, preferably of two con- The trunnlons are formed bycircular extensions 7 and 8 of the shell` and rest on *I rollers 9 and11, carried in suitable bearings 12 on standards 13. One of thesetrunnions is grooved and the rollers operating in conjunction with itare correspondingly shaped to prevent lateral displacement of the drum.One diiiiculty heretofore experienced in connection with rotary furnaceshas been inability to hold heat s ulicient for the purpose and which waslargely due to the number of openings provided in walls of the drum,there being'inlet and outlet openings for the charge and outlet openingsfor slag and dross. This I overcome by having only one opening 14 whichserves for all purposes. An outwardly extending neck is provided inconnection with this opening, the outside 15 of which is concentric withthe circumference of the drum and two sides 16', 16, of which are`parallel to the sides of the drum. Instead of a door serving as a'closure for this opening I provide a hood B, preferably formed ofre-brick supported,v on two circular arches 17 held togetherby braces 18and supported on standards 13 or on bars 19 connected to them.

The motion of the drum necessary to manipulatethe charge into propercondition is a rotary-reciprocatary one and alternates from the positionwhere the neck is now shown on the right side of Fig. 1, to the oneshownl in dotted lines on the left side.

Hood B extends accordingly so that opening 14 is always covered by itand at its edges it is extended inward-ly to form two flanges 21 intothe space between which the neck projects. Its parallel sides 16-16 fitclosely against these flanges so that the neck, during the motion of thedrum moves in this space back and forth between these flanges. Theyprevent lateral draft and loss of heat.

A gap or opening is provided in the hood to afford communication withopening 11 and a door 22 for it, hinged by means of a rod 2 3 supportedin-bearings 24.- l25 is a lever to manipulate this door. It is keptclosed by a balance weight 26.

Blast-heat is used and introduced through one of the trunnions asuitable fuel, preferably oil or gas being used. A burner 27 conpose.The pressure created by this blast is relieved by openings 28 1n thehood which provide also an outlet for rust and impurities separated fromthe charge by the blast. 5 For the purpose of charglng the f urnace thislatter is stopped with its openlng 14 opposite door 22 in the hood, asshown 1n dotted lines. For the purpose of removing the charge; thelfurnace is caused to rotate beyond the normal terminals of itsreciprocatory motion and caused to stop between them, which position isalso shown in dotted lines. A gap 29 is provided in the hood thereat toclear the exit. The ballA formed inside may drop upon an linclinedgrating 31 from which it is readily removed.

Slag and dross may discharge at the same time through t-he same openingand pass between t-he grating. A water-trough may be 2O provided belowthe grating to receive this matter.

The motion of the drum is a comparatively slow one and is obtained bymeans of Y a worm-wheel 32, driven by a worm 33.

The former is mounted on one of the trunnionsand shaft'34 of the wormrotates in bearings 35 and 36 suitably supported.l

The rotation of the worm-shaft as far as the reciprocatory motion of thedrum is con- 30 cerned is preferably controlled automatically for whichpurpose it 'is alternately driven by either one of two gear-wheels 37.They are rotated in opposite direction by a gear-wheel 38, mounted on apower-driven shaft 39.

They are loosely mounted on their Shaft 34,

but operatively connected to either one of gears 37 by a suitableclutch-device, the engagement being preferably frictional. 41 is thecone of this clutch mounted on shaft 34,

so as to rotate with the same, but free for longitudinal adjustment toengage either one or the other one of gear-wheels 37.

42 is a lever mounted at 43 and in engagement with clutch cone 41. It isused to con- 45 trol the clutch positively by hand when the drum is tobe moved into position for charging or dumping and is to be stopped ineither of these positions. Otherwise when the drum moves for agit-atingt-he charge the clutch-cone is adjusted automatically by the drum forthe purpose of alternately reversing the direction of its motion. Forsuch purpose an additional lever-arm 44 is provided and also pivoted at43'. It is held to the clutch-shifting lever 42 by a pin 45. Its otherfree endis alternately acted upon by two shifting-dogs 4G, one onlybeing now visible, the otherone, as the parts are shown, having justcontacted with said free end of arm 44 and shifted the clutch to reversethe motion of the drum to cause its neck to move toward the other (left)side, as shown by the arrow. In due time the dog now visible comes incont-act with arm 44 and shifts the clutch again to the other side.

When it is desirable to control the clutch direct as for instance whenthe drum is to be moved and stopped for charging or dumping, pin 45 4isremoved so as to disconnect arm44 from clutch-operating lever 42, which70 latter is now used to manipulate the clutch by hand. Any contact atthis time of oneof the dogs 46 with arm 44 is without effect upon theclutch. This part of the construction may be varied to suit specialconditions.

The charge is rolled on a bed of cinders some of which by being taken upserve as a flux andincrease the ductility of the iron.

The charge while forming becomes visible whenever opening 14 in the drumpasses 80 behind openings 28 in the hood and therefore its condition isunder constant observation.

Having described my invention, I claim as new: 8,5

1. In a busheling furnace, the combination of a. rotary drum with anopening in its annular side and a hood which surrounds this drum andserves as a closure for the Vopening therein and has an opening whichaffords communication with the interior of the drum through the openingin the same when rotation of the drum is stopped with this openingopposite the opening in the hood.

2. In a busheling furnace, the combination of a rotary drum providedwith an outwardly projecting neck'which has an opening communicatingwith the interior of the drum and a hood arranged around this drum so asto serve 'as a closure for the opening mentioned and has inwardlyprojecting ianges on it-s opposite lateral edges between which the neckof the drum yextendsand moves when the drum moves.

3. In a busheling furnace, the combination of a circular hood having agap, a drum supported for rot-ation within this hood and having anopening, mechanism to rota-te this drum and means to control thisrotation and toy permit stoppage of the drum with its opening oppositethe gap in the hood, said latter serving as a closure for the openingmentioned during rotation of the drum.

L4. In a busheling furnace, the combination of a drum having trunnionson opposite sides on which it is supported for rotation and one of whichhas an opening, an opening in the peripheral side of the drum to. permitthe charge to pass, a. hood which surrounds the drum and is providedwith an opening, means permitting the drum to be stopped with itsopening'opposite the opening in the hood, a blast-heat burnercommunicating with the drum through the open trunnion of the same andopenings in the hood and opposite the peripheral side of the drumaffording pressure relief when the opening in the drum passes oppositethese openings in the hood.

5. In a husheling-urnaee, the combination of a circularhood having a gapin its lowest part and an opening in its side above this gap, a door forthis opening, a drum supported Within this hood and provided with anopening in its peripheral side, means to operate this drum With a rotaryreciproeating motion which is so limited that the opening in the drumdoes not traverse the gap in the hood and means to control this motioncausing this opening to pass opposite the gap and to stop thereat, oropposite the opening in the hood. i

6. In a busheling-urnace, the combination of a drum, supports for it,mechanism to rotate it, a clutch which controls this mechanism and meanscarried on the drum to adjust the clutch to cause the mechanismmentioned to alternately reverse the rota- 'tion of the drum.

7. ,In -a busheling-fnrnace, the combination of a drum, supports for it,driving mechanism adapted to rotate it in opposite drection-s,i ,aClutch to control the driving mechanism, a hand-lever to manipulate theclutch and means operatively connected to `the lever and adapted to beactuated by the drum to adjust this lever automatically.

In testimony whereof, I hereunto aiiix my signature in the presence oftwo Witnesses. FREDERICK J. DROEGE. `Witnessesr C. SPENGEL, FRED.DROEGE, J r.

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